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thaifrog
Valve to piston clearance
#1
Just can't stay away
Joined:
2012/3/8 12:35
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Posts: 133
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Moving on with my project A15 engine build, i have gone for Mazda UC 77mm pistons.
These have a pin to top height of 31mm so i had the machine shop take off 1mm from the crown, this effectively makes them flat tops, there now a very small dish of around .2mm deep.. see picture.

I know i need to get back into the shed and measure it myself, but given a 1.2mm thick gasket and the valve lift with my Cam, am i likely to have the valves hitting the piston ?
Cam is a Camtech621, spec says .399 lift with 1.5 ratio rockers, so with the std 1.44 ones it should give .383 lift (9.73mm)
H89 head , unskimmed...

Attach file:


jpg  mazda UC 77mm piston after machining off 1mm.jpg (59.04 KB)
16289_566843dc1c705.jpg 359X369 px

jpg  mazda UC piston.jpg (102.61 KB)
16289_566843eb188d0.jpg 480X524 px

Posted on: 2015/12/9 15:09

Edited by thaifrog on 2015/12/9 15:25:25
Transfer the post to other applications Transfer

Subject Poster Date
     Valve to piston clearance thaifrog 2015/12/9 15:09
       Re: Valve to piston clearance ddgonzal 2015/12/9 22:47
       Re: Valve to piston clearance thaifrog 2015/12/10 2:53
       Re: Valve to piston clearance D 2015/12/10 3:30
         Re: Valve to piston clearance ddgonzal 2015/12/10 3:55
       Re: Valve to piston clearance D 2015/12/10 3:59
       Re: Valve to piston clearance thaifrog 2015/12/10 9:30
       Re: Valve to piston clearance thaifrog 2015/12/10 9:57
       Re: Valve to piston clearance dattoman_1000 2015/12/10 10:52
         Re: Valve to piston clearance nzdatman 2015/12/12 8:56
       Re: Valve to piston clearance D 2015/12/10 12:15
       Re: Valve to piston clearance D 2015/12/10 12:17
       Re: Valve to piston clearance thaifrog 2015/12/10 13:33
       Re: Valve to piston clearance thaifrog 2015/12/12 10:12
       Re: Valve to piston clearance Dundee1000 2015/12/14 9:03
         Re: Valve to piston clearance dattoman_1000 2015/12/14 10:22
       Re: Valve to piston clearance nzdatman 2015/12/16 8:16
       Re: Valve to piston clearance thaifrog 2015/12/16 10:10
         Re: Valve to piston clearance dattoman_1000 2015/12/16 13:15




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